Detergent tablet



FIG. 1 is a perspective view of a detergent tablet showing the new design;

FIG. 2 is a side view thereof as seen from all sides; and,

FIG. 3 is a top plan view.

The stippling in the drawings is representative of color contrast, not pattern. The surface(s) or portion(s) of the article not shown in the drawing or described in the specification form(s) no part of the claimed design. 

The ornamental design for a detergent tablet, as shown and described. 